Apple and Windows Drivers, it just don't matches. AMD sells many more GPU's thanks to Apple, but when it comes to iMac driver support, it's seems that it's not that important for AMD.
You've probably noticed by know that by default, you get the ATI 10.4 driver.
Since Apple is using so called "custom" cards in certain iMacs ( example: the 5750 in the 2010 iMac is a 5850 Mobility Radeon ) it's not always easy to install the latest update.
Follow these simple steps:

Yeah but did you send feedback? Whether they know or not is irrelevant if they need to do different fixes for various hardware configurations.

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Whether they know it or not is NOT irrelevant. They don't need different fixes for different hardware configurations because this issue happens the same regardless of configuration. Providing them with detailed feedback has proven to be irrelevant however.

Unknown-One has been talking back and forth with them directly about a multitude of issues and so far it has only shown how clueless and oblivious they all were to those issues. And it's not due to lack of feedback. So they either don't look at the feedback or they can't get it fixed (despite it working fine with previous driver versions). Which is worse?http://hardforum.com/showthread.php?t=1559534

I didn't sit around waiting for them to fix it (which would be never), I fixed it myself by editing the card's BIOS.

Whether they know it or not is NOT irrelevant. They don't need different fixes for different hardware configurations because this issue happens the same regardless of configuration. Providing them with detailed feedback has proven to be irrelevant however.

Unknown-One has been talking back and forth with them directly about a multitude of issues and so far it has only shown how clueless and oblivious they all were to those issues. And it's not due to lack of feedback. So they either don't look at the feedback or they can't get it fixed (despite it working fine with previous driver versions). Which is worse?http://hardforum.com/showthread.php?t=1559534

I didn't sit around waiting for them to fix it (which would be never), I fixed it myself by editing the card's BIOS.

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You would think everyone would have the problem then. If a bios flash fixed it, isn't the problem in the bios? Perhaps you need to speak to your GPU manufacturer.

11.6 seems to have fixed an issue I was having, where when folding on my GPUs, after turning off the screen and leaving for a couple hours - the screen would be blank when I got back. (running dummy plugs so the cards stay active without a screen)

The computer was still running, I could RDP in and it was still happily folding along, but blank screen on all outputs.

AMD latest PR shots. First they screw up the blur at Profiling and building restrictive crap around
drivers including signed by card installers which is most likely the most idiotic thing ever and now they drop PR that blur is gone ?? If someone
wants to look on next screen on compare between previous drivers and Catalyst 10.6 I got to say game picks are all A. AMD sponsored B. The
reality in real gaming is zero C. None of those game improvements means crap for any real gamer specially when their CFX/TFX/QFX can't
handle these on same speed as single cards.